BTW: I would like to have a link to that story about 89 people getting killed at a roller rink. I don't think that happened.
I found this story: http://dfw.cbslocal.com/2011/07/23/5-killed-in-grand-prairie-roller-rink-shooting/ in which there were 6 killed, 4 wounded.
I looked through several articles regarding that incident, and found nothing indicating that the shooter was licensed to carry a concealed handgun. Now, he was obviously carrying one - that doesn't mean he was doing so legally.